build: Inherit flags from rustc (#1279) #2073

Job	Run time
Test build-std (aarch64-tvos)	1m 48s
Test build-std (aarch64-tvos-sim)	1m 47s
Test wasm (wasm32-unknown-unknown)	14s
Test build-std (x86_64-tvos)	2m 24s
Test CUDA support	37s
MSRV (ubuntu-latest)	27s
MSRV (windows-latest)	45s
MSRV (macos-latest)	28s
Test (stable)	1m 36s
Test wasm32-wasip1-thread	34s
Test (beta)	1m 20s
Test (nightly)	1m 21s
Test (linux32)	1m 59s
Clippy	7s
Test (macos)	3m 48s
Test (aarch64-macos)	1m 50s
Test (aarch64-ios)	1m 26s
Rustfmt	6s
Test (win32)	3m 19s
Test (win64)	3m 33s
semver-checks	8s
Test (mingw32)	3m 17s
Test (mingw64)	3m 20s
Test (windows-2019)	3m 21s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 40s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	3m 15s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	3m 3s
	49m 33s

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